ML20002D993
| ML20002D993 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 08/11/1971 |
| From: | Walke G CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Morris P, Skovholt D US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8101230759 | |
| Download: ML20002D993 (3) | |
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. ve. Jackson. u.chigan 4920. Area code air 7se.osso August 11. 1971 Dr. Peter A. Morris, Director Re: Docket 50-155 Division of Reactor Licensing DPR-6 (ZEK)
US Atomic Energy Commission Washington, DC 20545
Dear Dr. Morrin:
Attention: Mr. D. J. Skovholt This letter is to inform you of an unscheduled automatic shutdown of the emergency diesel generator at the Big Rock Point Nuclear Plant on July 15, 1971.
On that date, during a routine test, the engine of the emergency diesel generator shut down automatically due to cooling water system high temperature. The reason for the engine shutdown was quickly determined. The engine was restarted within several minutes and operated normally.
The high temperature of the cooling water system was the result of the loss of prime to the engine-dri*.en cooling water system p"mp.
This pump takes a suction from the circulating water discharge bay, and discharges cool water through the liesel engine lube oil cooler. It is a centrifugal pump with a volume chamber integral to and above the pump of approximately one-gallon capacity. This volume chamber serves as a supply of primiM water to the pump during engine starting. After the engine test was completed, it was noted that there was a slight dripping of water from the pump shaft packing gland. Our conclusion was that this sli&P.t drippage during the two-week period between test runs was sufficient to allow exhaustion of the priming water supply for the pump.
The priming water for the pump is supplied by a priming waterline, controlled by a manual valve, from the service water sys-tem. The pump was primed from this service line and the engine re-started. It operated normally. The pump shaft packing gland was tightened slightly to eliminate any dripping during shutdown periods.
In addition, the manually operated valve in the service water supply line has been cracked slightly open to insure that the volume chamber will remain full and the pump will be properly primed for any required start of the diesel engine. Any excess water from the volume chamber it discharged through the pump and lube oil cooler to the lake.
3G40 Yl01430754
Dr. Petar A. Morris 2
Au6;ust 11,1971 Plans are being made to modify the system to provide a backup priming water supply to the cooling water pump that will b.e available during a loss of station power. This will insure that, in the unlikely occurrence of loss of prime to the cooling water pump similar to that experienced July 15, 1971 coupled with a loss of station power, a prim-ing water supply will be available to the cooling water pump of the emergency diesel generator.
These plans will be finalized via the. normal procedures re-quired under Title 10, Code of Federal Regulationc. Part 50 59 (10 CFR 50 59). They will be reported in future semiannual reports of operations.
Yours very truly.
GJW/dmb Gerald J. Wt
.e Nuclear Fuel Management CC: BHGrier Administrator USAEC Compliance, COO 1
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